APW7139
Dual 1.3MHz, 800mA Synchronous Step-Down Converter
Features
•
•
•
•
•
•
•
•
•
•
•
•
•
800mA Output Current on Each Channel
2.5V to 5.5V Input Voltage Range
1.3MHz Constant Frequency Operation
Low Dropout Operation at 100% Duty Cycle
Synchronous Topology
0.6V Low Reference Voltage
Typical 0.1
µA
Shutdown Current
Current Mode Operation
Over-Temperature Protection
Over-Current Protection
Up to 94% Efficiency
Internally Compensated
Lead Free and Green Devices Available
(RoHS Compliant)
General Description
The APW7139 consists of two independent 1.3MHz con-
stant frequency, current mode, and PWM step-down
converters. Each converter integrates a main switch with
a synchronous rectifier for high efficiency without an ex-
ternal Schottky diode. The APW7139 is ideal for powering
portable equipment that runs from a single cell Lithium-
Ion (Li+) battery. Each converter can supply 800mA of load
current from a 2.5V to 5.5V input voltage. The output volt-
age can be regulated as low as 0.6V. The APW7139 can
also run at 100% duty cycle for low dropout applications.
Pin Configuration
APW7139
EN1
FB1
IN2
1
2
3
DFN3x3-10
(Top View)
10 SW1
9 GND1
8 IN1
7 FB2
6 EN2
Applications
•
•
TV Tuner/Box
Portable Instrument
GND2 4
SW2
5
Exposed pad
on backside
Ordering and Marking Information
APW7139
Assembly Material
Handling Code
Temperature Range
Package Code
APW
7139
XXXXX
Package Code
QA : DFN3x3-10
Temperature Range
I : -40 to 85
o
C
Handling Code
TR : Tape & Reel
Assembly Material
G : Halogen and Lead Free Device
XXXXX - Date Code
APW7139 QA:
Note: ANPEC lead-free products contain molding compounds/die attach materials and 100% matte tin plate termination finish; which
are fully compliant with RoHS. ANPEC lead-free products meet or exceed the lead-free requirements of IPC/JEDEC J-STD-020D for
MSL classification at lead-free peak reflow temperature. ANPEC defines “Green” to mean lead-free (RoHS compliant) and halogen
free (Br or Cl does not exceed 900ppm by weight in homogeneous material and total of Br and Cl does not exceed 1500ppm by
weight).
ANPEC reserves the right to make changes to improve reliability or manufacturability without notice, and advise
customers to obtain the latest version of relevant information to verify before placing orders.
Copyright
©
ANPEC Electronics Corp.
Rev. A.4 - Aug., 2010
1
www.anpec.com.tw
APW7139
Absolute Maximum Ratings
Symbol
V
IN1/IN2
V
FB1/FB2
V
EN1/EN2
V
SW1/SW2
I
SW_PEAK
P
D
T
J
T
STG
T
SDR
(Note 1)
Rating
-0.3 ~ 6
-0.3 ~ V
IN1/IN2
+0.3
-0.3 ~ V
IN1/IN2
+0.3
-0.3 ~ V
IN1/IN2
+0.3
1.8
2
150
-65 ~ 150
260
Unit
V
V
V
V
A
W
°C
°C
°C
Parameter
Input Supply Voltage (IN1/IN2 to GND1/GND2)
Voltage on FB1 and FB2
(FB1/FB2 to GND1/GND2)
Voltage on EN1 and EN2
(EN1/EN2 to GND1/GND2)
Voltage on SW1 and SW2
(SW1/SW2 to GND1/GND2)
Peak SW Current
Maximum Power Dissipation (T
A
=25
o
C)
Maximum
Junction Temperature
Storage Temperature Range
Maximum Lead Soldering Temperature, 10 Seconds
Note 1: Absolute Maximum Ratings are those values beyond which the life of a device may be impaired. Exposure to absolute
maximum rating conditions for extended periods may affect device reliability.
Thermal Characteristics
Symbol
θ
JA
θ
JC
Parameter
Junction-to-Ambient Resistance in Free Air
(Note 2)
DFN3x3-10
Junction-to-Case Resistance in Free Air
DFN3x3-10
Typical Value
50
°C/W
12
Unit
Note 2:
θ
JA
is measured on with the device mounted the PCB with top-layer pad of approximate 1” square of 1 oz copper.
Recommended Operating Conditions
Symbol
V
IN1/IN2
R2/R4
I
OUT
T
A
T
J
Parameter
Input Supply Voltage (IN1/IN2 to GND1/GND2)
Feedback Resistance
(Note 3)
Output Current
Operating Ambient Temperature
Operating Junction Temperature
Range
2.5 ~ 5.5
~ 500
0 ~ 800
-40 ~ 85
-40 ~ 125
Unit
V
kΩ
mA
°C
°C
Note 3: Please refer to the typical application circuit.
Electrical Characteristics
The denotes the specifications that apply over V
IN
=3.6V and T
A
= -40°C ~ 85°C, otherwise specifications are at T
A
=25°C.
Symbol
V
IN1/IN2
I
FB1/FB2
V
FB1/FB2
∆V
FB1/FB2
I
PK
Parameter
Each Converter Input Voltage Range
FB1/FB2 Input Current
Each Converter Regulated Feedback
Voltage
Each Converter Reference Voltage Line
Regulation
Each Converter Peak Inductor Current
V
FB1/FB2
=0.6V
I
OUT
=0mA~800mA
-40
o
C≤T
A
≤85
o
C
V
IN1/IN2
=3.3V, V
FB
=0.5V or
V
OUT
=90%, Duty cycle < 35%
Test Conditions
Min.
2.5
-30
0.588
-
1.0
APW7139
Typ.
-
-
0.6
0.04
1.2
Max.
5.5
30
0.612
0.4
1.4
V
nA
V
%/V
A
Unit
Copyright
©
ANPEC Electronics Corp.
Rev. A.4 - Aug., 2010
2
www.anpec.com.tw
APW7139
Electrical Characteristics (Cont.)
The denotes the specifications that apply over V
IN
=3.6V and T
A
= -40°C ~ 85°C, otherwise specifications are at T
A
=25°C.
APW7139
Symbol
V
LOADR
I
Q
I
Q-SD
f
OSC
f
OSC_FFB
R
DS-P
R
DS-N
I
LSW
V
EN1/EN2
I
EN1/EN2
T
OTP
Parameter
Each Converter Load Regulation
Each Converter Quiescent Current
Each Converter Quiescent Current in
Shutdown
Each Converter Oscillator Frequency
Each Converter Frequency Foldback
Each Converter On Resistance of
PMOSFET
Each Converter On Resistance of
NMOSFET
Each Converter SW Leakage Current
Each Converter Enable Threshold
EN1/EN2 Leakage Current
Thermal Shutdown Threshold
Thermal Shutdown Hysteresis
Test Conditions
Min.
I
OUT
=10mA~800mA
V
FB
=0.7V
V
EN1/EN2
=0V, V
IN
=4.2V
V
FB
=0.6V
V
FB
=0V
I
SW
=100mA
I
SW
=-100mA
V
EN1
=0V, V
SW
=0V
or 5V,V
IN
=5V
-
-
-
1.05
-
-
-
-
0.3
-
-
-
Typ.
0.5
300
0.1
1.3
210
0.4
0.35
±0.01
1
±0.01
150
50
Max.
-
400
1
1.55
-
0.5
0.45
±1
1.5
±1
-
-
%
µA
µA
MHz
kHz
Ω
Ω
µA
V
µA
o
Unit
C
C
o
Copyright
©
ANPEC Electronics Corp.
Rev. A.4 - Aug., 2010
3
www.anpec.com.tw
APW7139
Typical Operating Characteristics
(Refer to the application circuit in the section “Typical Application Circuits”, V
IN
=3.6V, T
A
=25
o
C, unless otherwise specified)
Reference Voltage
0.615
0.610
Reference Voltage (V)
V
IN
=5.5V
0.605
0.600
0.595
0.590
0.585
-50
-25
0
25
50
75
100
125
Junction Temperature (
o
C)
1.0
-50
Oscillator Frequency (MHz)
1.5
1.4
1.3
Oscillator Frequency
V
IN
=3.6V
V
IN
=2.5V
1.2
1.1
-25
0
25
50
75
100
125
Junction Temperature (
o
C)
Oscillator Frequency vs. Supply Voltage
1.5
T
A
=25
o
C
Oscillator Frequency (MHz)
R
DS(ON)
vs. Temperature
700
V
IN
=2.7V
600
ON Resistance (mΩ)
500
400
300
200
100
0
-50
NMOS
PMOS
-25
0
25
50
75
100 125
V
IN
=4.2V
V
IN
=3.6V
1.4
1.3
1.2
1.1
1.0
2
3
4
Supply Voltage (V)
5
6
Junction Temperature (
o
C)
R
DS(ON)
vs. Input Voltage
600
500
ON Resistance (mΩ)
400
300
NMOS
200
100
0
0
1
2
3
4
5
6
Input Voltage (V)
PMOS
100
90
80
Efficiency vs. Output Current
Efficiency,
η
(%)
70
60
50
40
30
20
10
0
1
10
100
1000
V
IN
=5V
V
OUT
=1.2V
L=2.2µH
V
IN
=4.2V
V
IN
=3.3V
Output Current (mA)
Copyright
©
ANPEC Electronics Corp.
Rev. A.4 - Aug., 2010
4
www.anpec.com.tw
APW7139
Typical Operating Characteristics (Cont.)
(Refer to the application circuit in the section “Typical Application Circuits”, V
IN
=3.6V, T
A
=25
o
C, unless otherwise specified)
Efficiency vs. Output Current
100
90
80
Efficiency vs. Output Current
100
90
80
Efficiency,
η
(%)
60
50
40
30
20
10
0
1
10
100
1000
V
IN
=5V
V
IN
=4.2V
V
IN
=3.3V
Efficiency,
η
(%)
70
70
60
50
40
30
20
V
IN
=5V
V
OUT
=3.3V
L=2.2µH
1
10
100
1000
V
IN
=4.2V
V
IN
=3.7V
V
OUT
=1.8V
L=2.2µH
10
0
Output Current (mA)
Output Current (mA)
Copyright
©
ANPEC Electronics Corp.
Rev. A.4 - Aug., 2010
5
www.anpec.com.tw
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